cap XV Julia

this is a passage from Julia by Reed
cap XV almost to the last sentence, a direct statement of Mars to his son Romulus

Satis…in terrīs regnāvisti; nunc in caelō et in stellīs cum patre tuō cēterīsque dīs regnābis.

I am confuse with the adjective dīs in this sentence. which noun does it modify?
can I read it as

enough in the earth have you reigned, now in the sky and stars along with your father and others shall you reign, richly?

if I read this way then I take the adjective modifying reign
is it possible in Latin for adj treated as adverb?
or there are things I missed

Thank you in advance

See http://discourse.textkit.com/t/dis/2859/1 :